Update 9:45 a.m. | Democrat Val Arkoosh loaned her Pennsylvania congressional campaign $700,000 with weeks to go in a competitive primary, according to her pre-primary report filed Thursday with the Federal Election Commission.

Between April 1 and April 30, the physician, one of four Democrats seeking an open Philadelphia-area House seat, brought in $773,000 — including the sizeable personal loan — and reported $430,000 in cash on hand for the final days before the May 20 primary.

Thanks to her personal funds, Arkoosh's haul far outpaced the other three candidates in the 13th District contest, including former Rep. Marjorie Margolies, state Rep. Brendan Boyle and state Sen. Daylin Leach. However, Boyle and Leach both filed 48-hour reports with the FEC May 8 — a week after the closing of the pre-primary period — showing Boyle giving $40,000 and Leach $250,000 out of pocket to their respective campaigns.

Margolies, the mother-in-law of former first daughter Chelsea Clinton, raised $93,000 in April and reported $151,000 in cash on hand. Former Secretary of State Hillary Rodham Clinton is set to headline a New York fundraiser for Margolies next week, the Associated Press reported.

Before his updated filing, Leach reported raising $97,000 in April and ending the month with $279,000 in the bank. He is currently up on air with an ad attacking all of his primary opponents in the final days of the contest.

Boyle raised the least of the pack in April, bringing in just $35,000 and closing the month with $181,000 in cash on hand. Still, the state lawmaker has become the primary target of his competitors, who accuse him of not supporting abortion rights.

Outside groups such as EMILY's List and NARAL Pro-Choice America teamed up for a six-figure mail campaign attacking Boyle, without directly supporting either of the two women in the contest.

Democratic operatives say the Boyle attacks are a sign he is the front-runner. Boyle's base in the Philadelphia portion of the district, along with his union support, could give him the edge.

The other three candidates in the race are likely splitting the suburban Montgomery County portion of the 13th District, which could allow Boyle to squeak past them on May 20.

The candidates are seeking the seat of retiring Rep. Allyson Y. Schwartz, who is running for governor. The Democratic primary is likely to determine the next member of Congress from this heavily Democratic district, as the race is rated Safe Democratic by Rothenberg Political Report/Roll Call.